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Measurements of the cosmic ray p/p ratio are compared to predictions from an inhomogeneous disk-diffusion model of p production and propagation within the Galaxy, combined with a calculation of the modulation of the interstellar cosmic ray spectra as the particles propagate through the heliosphere to the Earth. The predictions agree with the observed p/p spectrum. Adding a finite p lifetime to the model, we obtain the limit τp 0.8 Myr (90 % C.L.). Subject headings: elementary particles — cosmic rays — solar wind Published in the Astrophysical Journal: 20 March 2000 1.
Geer et al. (Mon,) studied this question.
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